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AB = 12 cm
AD = 8 cm
LM = 6 cm
Dit : keliling persegi KLMN
disini bagian yang sama berarti LM = AB, MN = BC, NK = CD, KL = AD
karena 12(AB) : 2 = 6(LM).
jadi sisi KL=AD adalah 8 : 2 = 4
keliling persegi panjang KLMN :
6 + 6 + 4 + 4 = 20 cm
keliling Persegi ABCD :
12 + 8 + 12 + 8 = 40
40 : 2 = 20 cm.